【作者】 杜波；

【导师】 刘文颖； 王维洲；

【作者基本信息】 华北电力大学 ， 电气工程（专业学位）， 2013， 硕士

【摘要】 近年来,随着风电技术的快速发展和国家对新能源的政策支持,我国风力发电事业获得快速发展。但我国风资源分布的特点和发展现状,我国风电发展呈现出了大规模开发的特征,绝大多数大型风电场都位于远离负荷中心的偏远地区,大规模的风电需要通过超高压、远距离输送通道送到负荷中心。由于超高压送电线路具有较大的充电功率以及风电本身波动性和不确定性,使得大规模风电接入点和送出通道潮流产生强烈的波动性,从而导致大规模风电接入电网电压随着风电出力的变化而大范围波动,严重影响电网的电压运行质量和稳定性。因此研究大规模风电接入电网无功电压特性及控制方法具有重要的现实意义。本文首先分析了风电场无功电压控制的研究现状,研究和分析各种无功电压控制措施的原理和特点。通过建立风电机组的数学模型,分析了目前三种主流风电机组及其构成风电场的无功电压特性。分析了大规模风电接入电网在不同出力方式下及风电有功出力波动下的电压特性。研究基于灵敏度理论的电压/无功灵敏度系数求解方法,基于电压/无功灵敏度系数提出风电场、风电场群无功电压越限控制策略。针对大规模风电接入电网电压特性提出三级电压优化控制模式以及三级电压优化控制策略。最后,以酒泉电网为实例进行仿真计算分析,分析控制对酒泉电网因风电波动以及风电在不同有功出力方式下电压控制的效果,证明了本文提出的基于灵敏度法的大规模风电接入电网电压优化控制的正确和有效性。更多还原

【Abstract】 In recent years, with the rapid development of wind power technology and national policy support for new energy sources, the development of China’s wind power course is very fast. Because of the wind resource distribution and development status in our country, the wind power development shows the characteristics of large-scale, and the vast majority of large-scale wind farms locate in remote areas away from the load center. Because of the EHV Transmission Line with larger charging power and the volatility and uncertainty of wind power, trend of the large-scale wind power access point and the transmission channel fluctuate strongly, resulting the voltage of power grid accessing the large-scale wind power waves largely Along with the change of the wind power output and seriously affecting the voltage quality and stability. Therefore, to study the large-scale wind power grid reactive voltage characteristics and control methods has important practical significance.At first, this article analyzes the research status of the wind farm reactive power and voltage control at present, study and analysis the principles and characteristics of a variety of reactive power and voltage control measures. Through the establishment of a mathematical model of the wind turbine, the article analyzes the reactive voltage characteristics of the three main wind turbines and the wind farm constituting with them. Analyze the voltage characteristics of the power grid with large-scale wind power under a different output mode and the wind power active output fluctuations. Study solving method of voltage/reactive sensitivity coefficient based on sensitivity theory, and on the basis of voltage/reactive sensitivity coefficient, put forward reactive power and limited voltage control strategy of the wind farm and wind farm group. Proposed three-level optimization control mode and the three-level voltage optimization control strategy for the voltage characteristics of the large-scale wind power grid.Finally, the paper simulates and analyzes taking the Jiuquan grid for instance, analyzes the effect of the voltage control strategies on the Jiuquan grid when the wind power fluctuates and the active of the wind power is different, proves the feasibility and effectiveness of the large-scale wind power voltage optimization control based on the sensitivity of the method.更多还原